Wind movements are also modified in cities because buildings increase the friction on air flowing around them.
风向在城市里也会改变，因为建筑物增加了它们周围流动的空气的摩擦力。
2
"It describes the power needed to propel a bike against our everyday foes: gravity, weight, friction, wind resistance," he writes.
“它描述了推动自行车克服日常阻力——如引力、重量、摩擦力以及风阻——所需要的能量，”他这样写到。
3
The model of system loss model caused by wind resistance and bearing friction is established based on the regression analysis of flywheel's free brake curve.